>>> Sorry, I get it now.  Doubling nelts to force an operation would
>>> unnecessarily penalise folds of known single-element vectors,
>>> which really don't raise an exception.
>>> 
>>
>> Yeah, that’s the idea.

Sorry to chime in here but could we add a one-sentence comment 
documenting the idea?  It wasn't exactly obvious to me either.

-- 
Regards
 Robin

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